Frequency Response

This PLECS demo model analyzes the performance of Type 2 and Type 3 analog compensators used in power supply units (PSUs). The analyzed PSU is a buck converter with modeled-in inductor and capacitor non-idealities. The role of the capacitor and its effective series resistance (ESR) on the plant zero and poles is discussed. Furthermore, the compensators' performance is analyzed with respect to the phase margin, system bandwidth, and rate of change in gain at the crossover frequency.

The isolated flyback converter is a commonly-used converter for small power supplies such as battery chargers for portable devices and for auxiliary power supplies in electronic equipment. In this report the control design of a flyback converter that provides three low-voltage DC output voltages from a single-phase mains source is explained.

Active power factor correction (PFC) is used extensively in AC-DC converters since it allows the converter to meet harmonic standards without the need for a bulky and costly input filter that normally accompanies a passive AC-DC converter. In this application example, a single phase boost-type 600 W PFC converter is modeled in PLECS.

This PLECS demo model uses a basic buck converter to demonstrate the use of the Analysis Tools. The user can learn how to perform a steady-state simulation and obtain the loop gain of a voltage-regulated buck converter with a resistive load and extend the use of these tools to more complicated circuits.